Database Users

Using just one 3G frequency?

Hi, Im planning to buy an LG Optimus L7 II Dual P715, which is listed as having the following 3g frequencies: HSDPA 850 / 1900 / 2100
The issue is that I live in Argentina and I think that we have the following freqs: UMTS 850, UMTS 1900.
I know that this sounds like a model specific, but my real question is if just having one of the required frequencies (850) should work fine here? Im from IT, but I do not know nothing from networks, cell radio frequencies, etc. Ive searched the forum for similar questions and couldnt find anything either.
If there is someone knowledgeable from here, Im planning to use the phone dual sim capabilities with Personal and Movistar.
Thanks!
Ariel

just a small clarification, the cell phone that I intend to buy has the following frequencies: HSDPA 900 / 1900 / 2100
And here in Argentina we have: UMTS 850, UMTS 1900.
So the only frequency that I would be able to use would be: 1900, would this be enough?
Thanks.

f2froit said:
just a small clarification, the cell phone that I intend to buy has the following frequencies: HSDPA 900 / 1900 / 2100
And here in Argentina we have: UMTS 850, UMTS 1900.
So the only frequency that I would be able to use would be: 1900, would this be enough?
Thanks.
Click to expand...
Click to collapse
It depends on which company you have your phone and where you live. (UMTS = 3G // HSDPA = H (3,5G)
for example
3G BANDS IN ARGENTINA:
AMBA:
- Personal: 850 y 1900 MHz.
- Movistar: 850 MHz.
- Claro: 1900 MHz.
NORTE:
- Claro: 850 y 1900 MHz.
- Movistar: 1900 MHz.
- Personal: 850 y 1900 MHz.
SUR:
- Claro: 850 y 1900 MHz.
- Movistar: 850 y 1900 MHz.
- Personal: 1900 MHz.
good luck

ok, thanks for the reply... so it wont work, I live in AMBA and will use it with Personal + Movistar.
THanks!
Ariel

smilyar said:
It depends on which company you have your phone and where you live. (UMTS = 3G // HSDPA = H (3,5G)
for example
3G BANDS IN ARGENTINA:
AMBA:
- Personal: 850 y 1900 MHz.
- Movistar: 850 MHz.
- Claro: 1900 MHz.
NORTE:
- Claro: 850 y 1900 MHz.
- Movistar: 1900 MHz.
- Personal: 850 y 1900 MHz.
SUR:
- Claro: 850 y 1900 MHz.
- Movistar: 850 y 1900 MHz.
- Personal: 1900 MHz.
good luck
Click to expand...
Click to collapse
It depends on a few things. If the carrier uses one frequency for upstream data and one frequency for downstream data, it won't work. But even if you can only use 1900 MHz, you'll be without data in areas that use only 850 MHz.

Need expert help: do all snapdragon LTE support same bands?

I was recently told by a senior member of this forum that all snapdragon LTE support the same bands, and the bands are activated based on the sim card inserted.
is this true?
i went on samsung's website to compare the g900f and the canadian version of the s5, the supported bands listed are different.
i'm contemplating on buying the g900f, european version but i'm concerned with not being able to get on the 4g network here in Canada with the euro variant.
thanks for any input.

kl25 said:
I was recently told by a senior member of this forum that all snapdragon LTE support the same bands, and the bands are activated based on the sim card inserted.
is this true?
i went on samsung's website to compare the g900f and the canadian version of the s5, the supported bands listed are different.
i'm contemplating on buying the g900f, european version but i'm concerned with not being able to get on the 4g network here in Canada with the euro variant.
thanks for any input.
Click to expand...
Click to collapse
No, they don't. Hence the multitude of variants.

drakester09 said:
No, they don't. Hence the multitude of variants.
Click to expand...
Click to collapse
is the difference in the hardware or what region modem is on the device?

Hellscythe said:
is the difference in the hardware or what region modem is on the device?
Click to expand...
Click to collapse
On the chipset side of things there's only one difference: Exynos (G900H) and Snapdragon (the rest of models).
All Exynos carry an Intel baseband (of dubious power efficiency IMHO)
The modem as you mentioned and the carrier variants are responsible for the multitude of Snapdragon variants.

drakester09 said:
On the chipset side of things there's only one difference: Exynos (G900H) and Snapdragon (the rest of models).
All Exynos carry an Intel baseband (of dubious power efficiency IMHO)
The modem as you mentioned and the carrier variants are responsible for the multitude of Snapdragon variants.
Click to expand...
Click to collapse
So essentially my 900I can be turned into a 900F with a modem flash?

drakester09 said:
On the chipset side of things there's only one difference: Exynos (G900H) and Snapdragon (the rest of models).
All Exynos carry an Intel baseband (of dubious power efficiency IMHO)
The modem as you mentioned and the carrier variants are responsible for the multitude of Snapdragon variants.
Click to expand...
Click to collapse
does that mean i can flash a 900w8 modem onto a 900f?
oops sorry didnt realize poster above asked similar quesiton

Hellscythe said:
So essentially my 900I can be turned into a 900F with a modem flash?
Click to expand...
Click to collapse
kl25 said:
does that mean i can flash a 900w8 modem onto a 900f?
oops sorry didnt realize poster above asked similar quesiton
Click to expand...
Click to collapse
Nope, I think. The baseband must be different I would assume, they support different bands.
Just a little sample of what I mean:
3G Network:
HSDPA 850 / 900 / 1900 / 2100 - SM-G900H (Exynos, no 4G)
HSDPA 850 / 900 / 1900 / 2100 - SM-G900F
HSDPA 850 / 900 / 1700 / 1900 / 2100 - SM-G900M
HSDPA 850 / 1900 / 2100 - SM-G900A
HSDPA 850 / 1700 / 1900 / 2100 - SM-G900T
HSDPA 850 / 900 / 1900 / 2100 - SM-G900V, SM-G900P (CDMA)
4G Network
LTE 800 / 850 / 900 / 1800 / 1900 / 2100 / 2600 - SM-G900F
LTE 700 / 850 / 1700 / 1900 / 2100 / 2600 - SM-G900M
LTE 700 / 850 / 1700 / 1800 / 1900 / 2100 / 2600 - SM-G900A
LTE 700/850/900/1700/1800/1900/2100/2600 - SM-G900T
LTE 700 MHz Class 13 / 1700 / 2100 - SM-G900V (CDMA)
LTE 700 / 850 / 1700 / 1900 / 2100 - SM-G900R4 (CDMA)
LTE 850 / 1900 / 2500 - SM-G900P (CDMA)

Other (same?) question
drakester09 said:
Nope, I think. The baseband must be different I would assume, they support different bands.
Just a little sample of what I mean:
3G Network:
HSDPA 850 / 900 / 1900 / 2100 - SM-G900H (Exynos, no 4G)
HSDPA 850 / 900 / 1900 / 2100 - SM-G900F
HSDPA 850 / 900 / 1700 / 1900 / 2100 - SM-G900M
HSDPA 850 / 1900 / 2100 - SM-G900A
HSDPA 850 / 1700 / 1900 / 2100 - SM-G900T
HSDPA 850 / 900 / 1900 / 2100 - SM-G900V, SM-G900P (CDMA)
4G Network
LTE 800 / 850 / 900 / 1800 / 1900 / 2100 / 2600 - SM-G900F
LTE 700 / 850 / 1700 / 1900 / 2100 / 2600 - SM-G900M
LTE 700 / 850 / 1700 / 1800 / 1900 / 2100 / 2600 - SM-G900A
LTE 700/850/900/1700/1800/1900/2100/2600 - SM-G900T
LTE 700 MHz Class 13 / 1700 / 2100 - SM-G900V (CDMA)
LTE 700 / 850 / 1700 / 1900 / 2100 - SM-G900R4 (CDMA)
LTE 850 / 1900 / 2500 - SM-G900P (CDMA)
Click to expand...
Click to collapse
Hi! I have a similar question. I bought a GS5 (G900F Version, imported from Asia), In my country (Chile) it works on 4G LTE 2,6GHz, but the lower band of 4G is 700MHz, which apparently is not supported by this model (it supports 800MHz).
The official model here is the G900M, so my question is if I can flash the "modem.bin" from a G900M to my G900F, with Odin, but without rooting my device (to avoid Knox tripping or Imei problems)? Is it possible? or I simply waste my money?
Sorry for my bad english...
Thanks for your help!!!

Allaann said:
Hi! I have a similar question. I bought a GS5 (G900F Version, imported from Asia), In my country (Chile) it works on 4G LTE 2,6GHz, but the lower band of 4G is 700MHz, which apparently is not supported by this model (it supports 800MHz).
The official model here is the G900M, so my question is if I can flash the "modem.bin" from a G900M to my G900F, with Odin, but without rooting my device (to avoid Knox tripping or Imei problems)? Is it possible? or I simply waste my money?
Sorry for my bad english...
Thanks for your help!!!
Click to expand...
Click to collapse
No it wont work on many accounts, basically you cant flash a different CSC firmware etc to an alternate CSC device unless you change the CSC of that device or root(and of course the lte modem may not be supported). (an app called Phone INFO is available on Play Store to check, use at your own risk). That doesnt mean it is impossible, however, it is highly unlikely. I hope that cleared things up

No 3G Only Z3.

Hi everyone,
I've done some searches in regards of,
Do we have a "3G'd" Z3?
No, Basically all 4 / 5 variants of the Z3 is going to pack a LTE capable with it,
D6603: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 20)
D6633 :UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6643: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6653: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1900 (Band II),
2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
TD-LTE (Band 40)
FD-LTE (Bands 1, 3, 5, 7, 8, 28)
D6616: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 2, 4, 12)
Below you can add which carrier is for each model, thanks in advance.
Sources: Z3 Documentation White Paper By Sony
GSMArena's Z3 Specs Page.
Xperia Z3 Dual GSMArena's Specs Page

Every phone support 3G
Sent from my C6903 using XDA Free mobile app

All have quad band 2G
D6603, D6633, D6643, D6616 have penta-band 3G.
D6653 and chinese models (L55t, L55u) only have quad band 3G(1/2/5/8), missing the AWS 1700mhz band 4.
LTE, you'll have to look at your network and see which bands are more important and are supported

The 6603 has more bands than this! For LTE that is.

electrash said:
Every phone support 3G
Sent from my C6903 using XDA Free mobile app
Click to expand...
Click to collapse
Yup of course every 4G phone has a 3G band but i meant that i found a multiple model numbers and they all support 4G.

paperWastage said:
All have quad band 2G
D6603, D6633, D6643, D6616 have penta-band 3G.
D6653 and chinese models (L55t, L55u) only have quad band 3G(1/2/5/8), missing the AWS 1700mhz band 4.
LTE, you'll have to look at your network and see which bands are more important and are supported
Click to expand...
Click to collapse
If you look at the manual it says 4G.

Jhon998 said:
If you look at the manual it says 4G.
Click to expand...
Click to collapse
(if you are saying 4G = LTE, then yes)
but LTE is a lot more fragmented than 3G (penta band will cover almost all networks), 2G (quad band will cover almost all networks)
that's why it makes sense to say: quad-band 2G & penta-band 3G support = cover most people

paperWastage said:
(if you are saying 4G = LTE, then yes)
but LTE is a lot more fragmented than 3G (penta band will cover almost all networks), 2G (quad band will cover almost all networks)
that's why it makes sense to say quad-band 2G & penta-band 3G support = cover most people
Click to expand...
Click to collapse
Thanks for info, but i say 4G i mean LTE but i feel there is some difference.

Jhon998 said:
Hi everyone,
I have a simple answer to a question,
Do we have a 3G'd Z3?
No, Basically all 4 / 5 variants of the Z3 is going to pack a 4G capable with it,
D6603: 2G GSM 850 / 900 / 1800 / 1900
3G HSDPA 850 / 900 / 1700 / 1900 / 2100
4G LTE 700 / 800 / 1700 / 1800 / 2600
D6643: 2G GSM 850 / 900 / 1800 / 1900
3G HSDPA 850 / 900 / 1700 / 1900 / 2100
4G LTE 800 / 1700 / 1800 / 1900 / 2100 / 2600
D6653: 2G GSM 850 / 900 / 1800 / 1900
3G HSDPA 850 / 900 / 1700 / 1900 / 2100
4G LTE 700 / 800 / 850 / 900 / 1900 / 2100 / 2600
D6616: 2G GSM 850 / 900 / 1800 / 1900
3G HSDPA 850 / 900 / 1700 / 1900 / 2100
4G LTE 1700 / 1900 / 2100
D6633: Dual SIM / The same Bands as D6603.
I would be appreciated if someone could tell me what carriers is for every model, thanks in advance.
Sources: Z3 Documentation White Paper By Sony
GSMArena's Z3 Specs Page.
Xperia Z3 Dual GSMArena's Specs Page
Click to expand...
Click to collapse
The specs you listed is not accurate. I have posted the correct ones which I copied directly from the white paper.
D6603 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 20)
D6633 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6643 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6653 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1900 (Band II),2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
TD-LTE (Band 40)
FD-LTE (Bands 1, 3, 5, 7, 8, 28)
D6616 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 2, 4, 12)

Sango2 said:
The specs you listed is not accurate. I have posted the correct ones which I copied directly from the white paper.
D6603 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 13, 17, 20)
D6633 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6643 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17, 20)
D6653 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1900 (Band II),2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
TD-LTE (Band 40)
FD-LTE (Bands 1, 3, 5, 7, 8, 28)
D6616 UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),1900 (Band II), 2100 (Band I) MHz
GSM GPRS/EDGE 850, 900, 1800, 1900 MHz
LTE (Bands 2, 4, 12)
Click to expand...
Click to collapse
OP Updated, btw i like the new design of xda.

Jhon998 said:
OP Updated, btw i like the new design of xda.
Click to expand...
Click to collapse
Much better.
Oh yes, I like it the design too; much more optimized.

Could anyone confirm bands from 6653?.
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That screenshoot is from te very Z3 6653
Thanks.

awsome

caqo71 said:
Could anyone confirm bands from 6653?.
That screenshoot is from te very Z3 6653
Thanks.
Click to expand...
Click to collapse
Just an FYI. I have D6653 flashed with D6603 rom and it kept all of the same bands

Brendo said:
Just an FYI. I have D6653 flashed with D6603 rom and it kept all of the same bands
Click to expand...
Click to collapse
Does'n it affect anything else?, I know the bands are hardware related, so it could be nice to flash a 6603 rom. I'll try that. thanks :good:

caqo71 said:
Does'n it affect anything else?, I know the bands are hardware related, so it could be nice to flash a 6603 rom. I'll try that. thanks :good:
Click to expand...
Click to collapse
Nothing that I've noticed. Just a change in model number

Brendo said:
Nothing that I've noticed. Just a change in model number
Click to expand...
Click to collapse
Hi,
Do you know if it is possible to unlock LTE band 4 on D6653? I need to use that band with my carrier and the phone doesn't include it.
Thanks

Santis7 said:
Hi,
Do you know if it is possible to unlock LTE band 4 on D6653? I need to use that band with my carrier and the phone doesn't include it.
Thanks
Click to expand...
Click to collapse
Give this a try
http://forum.xda-developers.com/cro...ad-progress-please-leave-im-updating-t2871269
I have a D6653 as well, wanted to flash to D6603 so I can us a AWS carrier (and root)

Santis7 said:
Hi,
Do you know if it is possible to unlock LTE band 4 on D6653? I need to use that band with my carrier and the phone doesn't include it.
Thanks
Click to expand...
Click to collapse
weliyt said:
Give this a try
http://forum.xda-developers.com/cro...ad-progress-please-leave-im-updating-t2871269
I have a D6653 as well, wanted to flash to D6603 so I can us a AWS carrier (and root)
Click to expand...
Click to collapse
NO, bands are not unlockable, they are HARDWARE, so, wichever rom that you flash, they will keep you the same bands.

caqo71 said:
NO, bands are not unlockable, they are HARDWARE, so, wichever rom that you flash, they will keep you the same bands.
Click to expand...
Click to collapse
I don't see why not.
D6603 and D6653 have exactly the same hardware. Bands restriction can be lifted if those restrictions are by software.
Edit:
Flashing another ROM might not lift bands restriction, but manually editing system props might do the trick.
Have a read of the link I posted.

[Q] Unlocked AT&T s 4/s 4 mini in South Korea

Can anyone confirm if unlocked AT&T models of the Galaxy S 4 and S 4 mini would be compatible with networks in South Korea? Thanks in advance.

jooniloh said:
Can anyone confirm if unlocked AT&T models of the Galaxy S 4 and S 4 mini would be compatible with networks in South Korea? Thanks in advance.
Click to expand...
Click to collapse
You'll have to compare which radio frequencies the phone is compatible with and what the carrier uses. I know the first can be found on Wikipedia, and possibly the carrier frequencies also.
Sent from my SGH-I337

DeadlySin9 said:
You'll have to compare which radio frequencies the phone is compatible with and what the carrier uses. I know the first can be found on Wikipedia, and possibly the carrier frequencies also.
Sent from my SGH-I337
Click to expand...
Click to collapse
I did that, and then I ran into this chart and kinda freaked out. Do only the frequency bands matter?
The ATT S 4 seems to definitely have 850 MHz for LTE which SK has in Korea. I couldn't find as reliable information for the S 4 Mini though. Wikipedia also lists SK as having a UMTS/HSPA network at 2100 MHz and according to GSM Arena, the S 4 supports HSDPA on 2100 MHz. So does that mean it's compatible?

jooniloh said:
I did that, and then I ran into this chart and kinda freaked out. Do only the frequency bands matter?
The ATT S 4 seems to definitely have 850 MHz for LTE which SK has in Korea. I couldn't find as reliable information for the S 4 Mini though. Wikipedia also lists SK as having a UMTS/HSPA network at 2100 MHz and according to GSM Arena, the S 4 supports HSDPA on 2100 MHz. So does that mean it's compatible?
Click to expand...
Click to collapse
Wikipedia has the international S4 Mini listed with the same frequency bands, and if the I337 has them then I can only assume the Mini would. So as far as I know it should be compatible. However, if you're talking about SK Telecom, their wikipedia page also says things about CDMA, and I don't know if that'll work at all.

DeadlySin9 said:
Wikipedia has the international S4 Mini listed with the same frequency bands, and if the I337 has them then I can only assume the Mini would. So as far as I know it should be compatible. However, if you're talking about SK Telecom, their wikipedia page also says things about CDMA, and I don't know if that'll work at all.
Click to expand...
Click to collapse
:/ I was hoping for SK since that had the most matches with bands. Also, I don't think that's necessarily true because when I was looking at S4 specs on either Phone Arena or GSM Arena, they had listed some bands that the AT&T model didn't have that the others did. I assume the same would be the case for the S4 Mini but I don't recall seeing AT&T specific specs regarding the bands for it.

Here: http://www.gsmarena.com/samsung_i9505_galaxy_s4-5371.php
and here: http://en.wikipedia.org/wiki/SK_Telecom#Services
GSM Arena has this:
HSDPA 850 / 900 / 1900 / 2100
HSDPA 850 / 1900 / 2100 - SGH-i337
No 900 on AT&T.
and
LTE 800 / 850 / 900 / 1800 / 2100 / 2600
(Bands 1, 3, 5, 7, 8, 20)
LTE 700 / 850 / 1700 / 1900 / 2100 / 2600
(Bands 1, 2, 4, 5, 7, 17) - SGH-i337
No 800, 900, and 1800 on AT&T.
Wikipedia lists SK Telecom as having UMTS/HSPA on 2100 and LTE on 850. Wouldn't that work with the i337?

jooniloh said:
Here: http://www.gsmarena.com/samsung_i9505_galaxy_s4-5371.php
and here: http://en.wikipedia.org/wiki/SK_Telecom#Services
GSM Arena has this:
HSDPA 850 / 900 / 1900 / 2100
HSDPA 850 / 1900 / 2100 - SGH-i337
No 900 on AT&T.
and
LTE 800 / 850 / 900 / 1800 / 2100 / 2600
(Bands 1, 3, 5, 7, 8, 20)
LTE 700 / 850 / 1700 / 1900 / 2100 / 2600
(Bands 1, 2, 4, 5, 7, 17) - SGH-i337
No 800, 900, and 1800 on AT&T.
Wikipedia lists SK Telecom as having UMTS/HSPA on 2100 and LTE on 850. Wouldn't that work with the i337?
Click to expand...
Click to collapse
I suppose it should then, I've just known CDMA and GSM phones not to cross. My friend tried a Verizon SIM in my S4 and it seemed not to work, but I'm not knowledgeable about the differences of GSM and CDMA and whether or not all service will work correctly.

T-Mobile Dropped My Spectrum?

I'm currently using a Samsung Galaxy S4 I9505 International (GSM card)
I'm now getting data speeds of 0.13 Bps. That can't continue.
I'm When I spoke to T-Mobile support they told me that the 1900 Mhz spectrum (LTE) is being dropped for the new 600 Mhz spectrum. This is for 5G. They advised me to get a phone that has 600 Mhz (phones not available yet) and 2100 Mhz spectrum. In the data below you can see that my phone can use 1900 Mhz for 2G and 3G. This is a mess. Apparently the 1900 Mhz my phone used to use (and provided quite good data speeds) has already been dropped, but the 600 Mhz I will need is not yet in phones currently being sold. What do you recommend I do?
The changes are related to T-Mobile aquiring new frequencies so they can improve service and data speeds. This implies that T-Mobile dropped a frequency which my phone used (1900 Mhz?), and which used to give me quite good data speeds.
So my slow data speeds are the result of changes made by T-Mobile. I brought my own phone, and did not purchase from T-Mobile, so they didn't offer me a new phone cheap.
My research shows me that my area has 700 Mhz LTE. But apparently my phone can't use that.
"T-Mobile Lights Up Greater Boston Area With Extended Range LTE"
https://newsroom.t-mobile.com/news-...eater-boston-area-with-extended-range-lte.htm
http://maps.spectrumgateway.com/t-mobile-700-mhz-spectrum.html
Wikipedia
Samsung Galaxy S4 - Wikipedia
2G: 850, 900, 1800, 1900 MHz, GSM / GPRS / EDGE
3G: 850, 900, 1900, 2100 MHz, UMTS / HSPA+
4G: 800, 850, 900, 1800, 2100, 2600 MHz

Get a device that uses US LTE bands. Your only other option is to risk bricking your S4 to add US bands to its radio chip.